[pro] Inflict 1 unpreventable damage on an ally or retainer.
[mel] Discard a Shattering Crescendo to inflict 2 unpreventable damage on each of up to 2 minions controlled by a single Methuselah.
[MEL] As [mel] above, but for 3 unpreventable damage each.

If we watch part of text Spirit Marionette and Propoganda and LSJ answer:
" No. There're both directed actions, so the Secured minion is protected."

probably minion with Secure Haven cannot be target with Shattering Crescendo
(Melpominee discipline) but i want to someone confirm that.